dhumanizer

well, found my "solution" I now run my CPU pump from a sys fan header and a sys fan from my cpu pump. no issues anymore. No idea what the cause was and my temps are just fine - idling at a cool 30 and maxing out at 63 while running cinebench for about 30 minutes.

I have exactly the same problem with it not booting up and the CPU led just being on.... MSI b450 Carbon M/b Ryzen 3600 Though I have a CM ML240RGB AIO on it. the only thing I've noticed that works is when I unplug the pump header from the pump fan header on the mobo. Switch on the pc - wait for it to pass the bios and post then plug the pump back into the header while it's running. a very risky workaround I know. But this only happens if the pc's been switched off for +/-8 hours. Restarting or anything after it's been running for a while is just fine. My husband has exactly the same cooler and motherboard (3700x amd) and his runs perfectly fine. We're both running the latest bios update as well... I've reseated the everything from the ram, cpu , cpu cooler and every cable connected to the m/b Does this mean I have a faulty/glitchy cooler/pump?